body {
background-image:url('http://www.dvdnet.altervista.org/immagini/bilancia.jpg');
background-attachment:fixed;
text-align:left;
font-family:Arial;}

div#contenitore {
width:900px; 
height:400px;
margin:0 auto;}

div#header {
background:silver;
border-top-left-radius: 2em; border-top-right-radius: 2em;}

div#colsx {
background:white;
width:200px; 
height:400px;
float:left;  }

div#coldx {
background:gray;
 width:700px; 
height:400px;
 float:left; }

div#footer { 
background:silver; 
clear:left;
border-bottom-left-radius: 2em; border-bottom-right-radius: 2em; }

p {
text-align:justify;  
font-size:10px;}

button {
width:180px;}